ASoC: SOF: pci: Add prepare/complete PM callbacks

Use the new implemented snd_sof_prepare() and snd_sof_complete() as the
power management callbacks for pci probing platforms.

Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20191025224122.7718-27-pierre-louis.bossart@linux.intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>